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Re: expat canuk- new user and new pool- in costa rica

Welcome to TFP!!!

Can you confirm that type of chlorine you are using?

CYA will be 0 ppm in the well water ... so you have to add it. If you are using dichor / trichlor, that will be adding CYA with the FC, so you have to keep track how much you are adding to make sure the CYA does not get too high. If it is cal-hypo, which I am guessing it is, then that is adding calcium and your CYA will still be zero. With no CYA, the FC will quickly be burned off by the sun, so that could be why the pool is turning green.

Have you read through Pool School (button at upper right) to get a full understanding of the pool's chemistry?

I see in your signature a tablet chlorinator ... I would recommend you avoid using it to avoid your CYA growing out of control

The liquid chlorine is much easier to control if it is reasonably priced down there.

Start using the poolcalculator.com to determine how much of each chemical you need to add to get certain effects.